Thermostatic heat-controlling device.



P. & W. G. TYSON.

THERMOSTATIG HEAT CONTROLLING DEVICE.

APPLICATION FILED IEB.25,1909.

Patented Mar. 9, 1915.

3 SBEETSSHEET 1.

F. & w. G. TYSON. THERMOSTATIO HEAT CONTROLLING DEVICE.

APPLICATION FILED FEB. 25, 1909.

1 ,1 3 1 A44 n ed Mar. 9, 1915.

3 SHEETS-SHEET 2.

3 SHEETS-SHEET 3.

Patented Mar. 9, 1915.

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FRANK TYSON AND WILLIAM G. TYSON, 0F CANTON, OHIO.

THERMOSTATIC HEAT-CONTROLLING DEVICE.

Specification of Letters Patent.

Patented Mar.9,1915.

Application filed February 25, 1909. Serial No. 479,866.

To all whom it may concern:

Be it known that we, FRANK TYsoN and WVILLIAM G. TYSON, both citizens of the United States, residing in Canton, Ohio, have invented certain Improvements in Thermostatic Heatcontrollin Devices of which the following is a specification.

The object of our invention is to provide simple and reliable means for effecting thermostatic control of the flow of a heating fluid (hereinafter, for convenience, referred to as steam) to a pasteurizer or other liquid heating device. For convenience we will hereinafter refer to such device as a pasteurizer and to the liquid to be heated as milk? 4 In the accompanying drawingsFigure 1 is a top or plan view of that portion of the apparatus to which our invention particularly relates; Fig. 2 is a sectional view, on an enlarged scale, of the thermostaticallyoperated supplementary valve whereby the operation of the main steam-controlling valve is governed; Fig. 3 is a sectional view, on an enlarged scale, of said main steamcontrolling valve, the same being shown in the open position; Fig. 4 is a similar view showing the valve in the closed position; Fig. 5 is a view, partly in vertical section and partly in elevation, of the thermostat;

Fig. 6 is a longitudinal section on the line ca, Fig. 1, and Fig. 7 is a sectional view of a modified form of steam-controlling valve.

In the operation of a pasteurizer it is essential, inorder to obtain the desired result, that the milk should not be heated much above a pre-deterniined degree, and that its temperature should not be permitted to fall much below such predetermined degree, and the readiest means of effecting this object is by proper control of they steam with which the pasteurizer is supplied. Ourinvention has therefore been devised with the view of providing simple and reliable means whereby the heat of thevolume of milk flowing from the pasteurizer is caused to thermostatically govern the flow of steam to said pasteurizer.

The. thermostat shown in the drawing comprises a two part casing 1, 2,'the lower part 1 having a deep groove 3, which, at one side of thecasing, is divided by a partition 4 whereby the stream of heated milk entering at the inlet 5 is divided, one portion of said stream passing to the right through the groove 3, the other portion passing to the left through said groove, and both streams being united at the outlet 6, from which they are jointly discharged.

Vithin each half of the groove 3 is lo-- cated a bent and elastic tube 7, filled with some volatile liquid, each tube being rigidly secured at one end to a stud 9 depending from the cap or cover 2 of the casing, but being free at the opposite end and having said free end connected by a link 10 to a floating lever 11, the points of connection of the links being separated from each other to any desired extent.

By preference, the studs, 9, to which the elastic tubes 7 are secured, are disposed on ppposite sides of the casing, whereby the in rs the lever 11, and any movement of the free end of either of the elastic tubes 7 is transmitted to the lever independently of the other .but supplements the action thereof, contraction of the tubes caused by a lowering of the temperature serving to move the lever in the direction of the arrow :0, (Fig. 1) and expansion of the tubes caused by an increase of their temperature moving the lever in the direction of the arrow y (Fig. 1), the movement of the lever representing the aggregate of the movement of both tubes.

Mounted in a suitable bearing on the casing 1 is a slide 12, hollow at its outer end and having an internally threaded portion to which is adapted the threaded end of the stem 13 of a duplex valve 15, which coacts with seats formed in a partition 16 separating the inlet and outlet chambers of a valve. chest 17, the latter being suitably mounted on the casing 1, as shown in Fig. 1'.

Vith the inlet chamber of this valve chest 17 communicates a pipe 19 of contracted diameter leading from the main steam pipe 20, and from said branch pipe 19 another pipe 21 of contracted diameter leads to a balancing chamber of the main steam-controlling valve 22 hereinafter described.

The 'lower'portion of the valve stem 13 is acted upon by a coiled spring 23, which normally tends to maintain the double valve 15 in the open position, and the area of the ports in the partition 16 of the valve 17 are so proportioned in respect to the area of the steam supply pipe 19 that when the valves 15 are open a free flow through the valve chest 17 of allot the steam supplied by the 10 project in opposite directions from 35 the steam upon thesupplementary valve 31 pipe 19 is provided, and no pressure, or but very little pressure, is maintained in the branch pipe 21. r i

' The main steam-controlling valve chest 22 has an inlet chamber 2 L communicating with the main steam pipe 20,and an outlet chamber 25 leading to the pasteurizer and the flow through the valve chest 22 is governed by a valve 26 which is secured to or forms part of a piston 27 free to slide in the upper portion of the chest/22, as shown in Figs. 3 and 4, the lifting or opening movement of the valve being restricted as may be desired by the adjustment of a screw stem 29 adapted to ,a threaded opening in a 1 cap 30 of the valve.

The valve shown in Figs. 3 and 4 is of the same type as that shown in Letters Patent No. 7 02,383 granted June 10th, 1902, to NH- liam G. Tyson, and it has, inaddition to the main valve, 26 a supplementary valve 31 depending therefrom and capable of a certain amount of sliding movement in respect thereto, the flow of the steam around this depending supplementary valve tending constantly to draw the main valve down onto its seat, butthis movement, in the absence of any pressure on the top of the valve, being resisted by the upward pressure of the steam upon the latter. If, however, steam under a pressure approximating that in the main steam pipe 20 is admitted to the chamber 32 above the valve 26 a portion of the ,upward pressure against the underside of said valve is balanced and the action of predetermined degree the elastic tubes 7 will be so contracted that the outer end of the lever 11 will be held free from contact with the inner end of the slide 12, the double vali e 15 will be held open, the free escape of steam from the pipe 19, will be permitted, and there will be no such pressure of steam exerted in the chamber 32 of the main valve chest 22 as will cause the main valve therein to be .forced against its seat, .consequently the free flow of steam will be maintained through the main valve chest 22. As soon,

however, as the temperature of the milk flowing through the casing of the thermostat exceeds a predetermined degree, expansion .of the elastic tubes 7 will follow and there Will be such movement of the lever 11% will'close the double valve 15 and prevent any further escape of steam through the supplementary valve chest 17, consequently steam under pressure will pass through the branch 21 and into the chamber 32 above the main valve 26, and said valve will be closed so as to cut off any further flow of steam through the main valve chest until the term perature of the milk has been so far reduced as to' cause contraction of the elastic tubes 7, a release of the slide 12 from the pressure of the lever 11, a re-opening of the double valve 15 and an escape of steam from the chamber 32 of the main valve chest and from the pipe 21, thereby permitting the main valve26 to again open and permit a flow of steam through the main valve chest.

The adjustment of the valve 26 by means of the manually-operated stem 29 permits the attendant to maintain, through the main valve chest 22, a normal flow of steam in quantity suflicient to heatthe milk to the desired temperature, the thermostatic device being intended to prevent overheating of the milk by providing for a temporary cutting s ofi of the flow of steam to the pasteurizer asv soon as the temperature oi the milk exceeds the predetermined temperature to which it is to be heated.

In Fig. 7 we have illustrated a modified form of main val ve which may be used in carrying out our invention, 22 in this figure representing the main valvechest having an inlet branch 24, an outlet branch 25*, and a valve 26 whereby the flow from the inlet to the outlet isgoverned, this valve-having a piston 27 fitted to a chamber 32 in the upper portion of the chest, which chamber is in communication with the pipe 21.

Between the piston extension of the valve 26 and the hand-operated screw stem 29 is interposed a coiled spring 33 which tends to normally depress the valve 26 but is Without sufficient force to overcome the upward pressure of the steam upon said valve, consequently, when the chamber. 32 is without steam pressure therein, the valve will be held open by the steam pressure beneath it, but as soon as the steam is admitted to the chamber32 and the pressure of the same is added to that of the spring 33 to project the valve the effect of the combined pressures will be suflicient to thus project the valve, close it against its seat and cut off further flow of the steam through the main chest 22, the valve being again opened bythe steam pressure thereupon as soon as the pressure of steam is removed from the chamber 32*.

The spring 33 may be'dispensed with, if the area of piston exposed in the chamber 32 is greater than the area of the valve acted upon by theupward pressure of steam in the main valve chest. The device described not only constitutes an extremely sensitive thermostatic governing device but it provides for the operation of the main valve by steam derived from the is n tary valve chest a double valve and double valve seat because of the increased area of passage thereby provided and the limited movement of valve necessary to open or close said passage a single valve can, if desired, be employed, and other modifications of detail m; y be resorted to Within the scope,

of our invention.

lVe cla1m: 1. Thermostatic apparatus 1n which are combined a thermostat comprising a casing having therein a pair of elastic members, each secured to the casing at one end and free at the other, the fixed end of one memher being adjacent to the free end ofthe other, a lever joined to the free ends of the elastic members by separated connections, one extending in one direction from the lever and the other extending in the opposite direction therefrom, a controlling valve for the heating fluid, and a slide connected to the stem of said valve and being acted upon by said lever.

Thermostatic apparatus in which are combined a thermostat comprising a casing having a groove therein and a partition whereby the flow through said groove is directed partly to the right and partly to the left, an elastic member in each part of l the groove, a lever connected to each of said elastic members and operated by the expansion or contraction of the same, a controlling valve for the heating fluid, and a slide connected to the stem of said valve and being acted upon by said lever.

In testimony whereof, we have signed our names to this specification, in the presence of two subscribing Witnesses.

FRANK TYSON. WILLIAM G. TYSON;

" lVitnesses:

H. B. STEWART, WV. F. HAY. 

